Car roof



Feb. 23, 1932.

I w. P. MURPHY 1,846,812

CAR ROOF Filed Deo.

flfl they occur,

Patented Feb. 23, 1932 *UNITED r`STAT1-:IS PATENT' WALTER P. MURPHY, E oIIIoAGo, ILLINOIS, 'AssIGNoE To4` P. H..1\IUEPIIY ooMPANir,V

or NEw KENSINGTON, PENNSYLVANIA,

A coEPoEATIoN foE PENN'sYLvn'NIAQ GAR EooE My invention relatesto metal car roofs and -its principal object is to utilize the metal of advantage than has been `practicable heretof T* fore. The invention consists principally. in

making the roof sheets with their marginal portions thicker'than the intervening body Vportion throughout a width vvsuiioient for formingfseam or 'carline members. It also f2fl0-consists in the arrangements and combinations hereinafter described Vand claimed.

In the Yaccompanying drawings, which form partv of this specification and wherein like numerals referto like parts wherever i Fig. lis a plan view'of a part of a-car roof Vembodyingmy invention,

Fig. 2 is a vertical cross-section of the roofV` on the line 2,'-2' of Fig.k 1,V saidV section being 'i20- taken lengthwiseffthrough the body of the roof sheet, f .f Figf -is ay vertical cross-section ofthe roof onf the line 3 3 of Fig. 1, said section being takenV lengthwise through a seam,' Y L 25 Fig. 4 is a longitudinalcross-'section of the roof on the off-set line 4--4 of Fig.V l7

Fig. 5 is a longitudinal section-ofthe roof along the ridge as indicated bythe line 5 -5 OfFigrana down beyond the upstanding anges of said Y side plates and riveted thereto.V The mar` gins of the` roof sheets are lformed into in# verted channels 3. The channels of adjacent sheets overlap and are riveted together by means of vertically disposed rivetsll to form*Y hollow ribs or carlines 5. The inverted Chan'-, nels of the sheets and the hollow roof carlines formed of such channels are of maximum depth at the ridge of the roof and taper to# wards the eaves; andthe depth ofthe depending outer flange of each inverted channel p andthe lside plates.VV the roof sheets more eiiiciently and to greater jbody of the sheet.` -Accordinglyythe .present 'f invention discardsl sheets of uniform thicknessjand makes use of sheets whose marginal 1 portions are. of different thickness Vfrom that fof, the body portion, thei thicknesses ofthe F ig.`6 isa cross-sectional viewofla roofv Appiicaaon :nea December 26, 1929. serial No.1416,524.f Y i tweenthe eaves corner portions sheets Roofs of the K general design Yabove Vdescribed are wellv known and render good service; .but heretofore they l have been made with sheetsof even thickness throughout. That is, the practice heretofore `has beento select'and press up commercial 'roof sheets vof athickness that is uniform throughout and suicient to take care of themaxlmumstress expected to be appliedto the sheet-sin service, .wherever the point of `application .of suchstress may be. 1

One frequent'result `of suchV use of sheets of uniform thickness is: that,Y in order. ,to

. provide sufficient "metal yin `the i ribs totake care of the stress on the ribs,A sheets are selected of greater thickness thanv is needed to take care of the expected stresses-inthe bodyYY and marginal portions beingudeter-A f mined generally by the nature and famount of the work lrequired of them; f

)Referring to Fig. '6, it is noted'that my new roof sheet Qais initially of rectangular form, with a parallel-sided :loody'portiimf` .bordered on each side by Vparallel-sided marf ginal portions 8 ofgreater-.thickness thanl the body portion. The lowersurface. ofthe vsheet is preferably flush' fromsidexedgefto.

side edge, the increasein thicknessshowing` on the upper surface. These? marginal por# tions are pressed intoV in designing roofs, especiallyas tothe seam construction thereof,` than isv vpracticable when the .seam or marginal portionsv and the bodyportions are ofequal thickness. Likethickness, my new sheet may be sov designed Y :that any surplusymetal inthefbody y'portion increases fromthe ridge tothe eaves'. AnA angular bracketmember 6 is interposed be-f above'that, requiredto takeV care of the eX- s theV inverted 'channel members above,VV described. or .finto ribs or flanges offother suitable designs.` s Y -Wise 1nA comparison'- withfa vsheet of'uniform f "35 angle' :at'the side of an upstandingseam and feo,

' throughout Vtheir widths and struck up into surplus metal may be added to the marginal portions with consequent increase in the strength and durability of the roof. Thus, for a given total weight of metal, it becomes practicable to concentrate a lmuch larger proportion :in the roof ribs or^seains, wherefit is needed on accountof the greater concentration therein of the stress. For instance, heretofore, inmaking riveted steel roofs of the drawings,'sheets"were frequently used of a uniform thickness of 35 inch and a width of.

forty-eight inches. According to the preseach; side margin vof a-thickness `of 11/8 inch, and the intervening twenty-four inchesor -half of the Sentire widthof tl'ie'sheet imade with aV thickness of. inch; in which case 'there would be the .same total weight of metal as inthe sheet 'of uniform thickness but? the kmetal would bemore effectively distributed for taking care of the stresses. Likewise, for a roof .of equal strength, the new sheets may "bemade with af total weight 'of metalless -thanfthe ttal weight of -a roof -with sheets `ofuniform thickness.- This saving in weight effects economy not only-in the Vcost-of the "sheets,butreduces thetotal weight of the Hcarfand has the importantadvantage'that suchireductionof weight is made `at the maX- imum distance'above the center of 'gravity'.

Under service conditions of' a carv roof, ycinders 4andinoisture are :liable tolodge `in the i cause the sheet to be rusted out in thisangle, vwhile the sheet isjstill ineiicellent condition elsewhere.y By making this angle portion thicker-than the body porti0n,"the'effective life yof A.the sheetf'is materiallyY increased. Likewiseithere is a'fgieater resistance to bending, and there Aisi less dangerof rivets tearing ithe sheets .during theweaving ofthe car.

. While I have illustrated my invention'- as embodied lin a `specific design using sheets with about onequarter of their width'thickcned-'along each side, it isito be understood o of December, 1929.

that such design is `only illustrative and that the inventionis designs.v 1 z What/I claim is:

' 1. 1A car roof sheet having a parallel sided bodyzportion andfwhose side marginal `poro tions are undividedand of greater vthickness thanothe body portion andare adapted to be` ,shaped to form carline members. Y

general designjshown 1in the accompanying ent invention, a sheet; of: thisfsame widths` may be made with about twelve inches alongl form hollow. carlines;

applicable to roofs fof other throughout their widths and thicker than the body portions thereof.`

4. A car roof comprising metal roof sheets arranged side by side, the side marginal portions of said sheets being undivided andV thicker than the body portions thereof and rivetedv together.

shaped for'seam forming,engagement.` v 7. A :car roof 'comprising metal roof sheets whose side'marginal portions are, of inverted vchannel shapel and are thicker than their bodyportions, said marginalV portions inter-:jg5 locking to VVform hollow carlines. j

8. Acar roof comprising metal roofsheets whose side marginal portions are of inverted channel shape and are thicker than theirbody portions, said marginal portions interlockinggmo and riveted togethery to' foim hollowl carlines. 9. `A carroof comprising side plates and .metal roof sheets secured to said plates-and spanning thespace between them, the,side marginal portions of said sheets being undi-'iQ videdv andV thicker :than 'their body portions and shaped to form connectingfseams'; e 10..'A; carxroof comprisingside plates 'and -metal roof sheets secured `tosaid plates and spanning the lspace between'them, the sidc=5100 marginal portions of said sheets being'thicker than their body.- portionsand 'pressed -into invertedv channelshape', lsaid marginal portions interlockingv and Y riveted vvtogether l to i i "i "i105 l1. A pcar roofV sheet v,comprisinga bodyportion and side marginal portions of greater thickness than the body portion, each marginal portion being approximately half 'the width; of-the body portion and?` struck Y' up'gflng into a seam forming member.

Signed at Chicago, Illinois, this `19t-h`day WALTERY i). Minni'ii'ir'.V

: 2. Acar roof sheetcomprising a body-pory i .tionhand side marginalportions of greaterV thi'cknessfthan thebody portion, said mar- ;ginal portions beingv of even 'thickness y seam @forming members.

' 3. A car roofy comprising metal roof sheetsarranged side by side, the side marginal'por- A-iao 

